Liquid crystal screen test industrial control board and test method thereof

Abstract

The invention relates to the field of liquid crystal screen testing, and specifically provides a liquid crystal screen testing industrial control board and a testing method thereof, comprising: a main control chip, a driving circuit, a testing circuit, a testing response circuit and a testing regulating circuit; wherein the input end of the driving circuit is used to connect a driving power supply; the testing circuit comprises a first liquid crystal screen switching interface and a host interface, the first liquid crystal screen switching interface is used to connect a liquid crystal screen to be tested, and the host interface is used to connect a computer device; the regulating circuit comprises a regulator, the regulator is respectively connected to a first transistor and a second transistor, the first transistor is connected to a third resistor, the second transistor is connected to a fourth resistor, the first transistor and the second transistor are connected to the main control chip, the first resistor is used to adjust the cooling parameters of the liquid crystal display screen, and the fourth resistor is used to adjust the TEC parameters of the liquid crystal display screen; the testing response circuit comprises an LED lamp and an indicator light.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal screen testing, and in particular to a liquid crystal screen testing industrial control board and a testing method thereof. Background Art

[0002] At present, in the field of testing LCD screen voltage and cooling (especially applications related to thermoelectric coolers TEC), voltage testing is usually integrated into automated test systems, which can quickly and accurately measure the supply voltage of LCD panels, including backlight voltage, logic voltage, etc., to ensure that they are within the specified range to ensure display quality. There are a variety of portable meters and handheld test tools on the market, which are convenient for on-site rapid detection of LCD screen voltage conditions, suitable for use in maintenance and service industries.

[0003] However, the existing testing technology also has huge technical defects. The existing technology can only test the stability of voltage, but cannot test the limit voltage, stability and responsiveness of the LCD screen. The test results are all reflected in the form of data. The test can only be based on automatic testing, and the test voltage cannot be adjusted at all times. The quality of the LCD screen is mainly judged based on the test parameters. However, the LCD screen that can cool down can be adjusted by temperature. Compared with the conventional LCD display, it can be adjusted by temperature, so that the existing testing technology will have test deviations during testing because the temperature factor has not been considered. For example: when the LCD screen with temperature adjustment automatically cools down, in the traditional testing technology, if the over-limit test (limit parameter, such as limit voltage) is used, the sensor is normal in temperature detection, but abnormal in circuit detection, and a detection contradiction occurs. There are even some parts with normal temperature detection, and the test circuit will ignore the voltage and other parameter tests during this period. As a result, incorrect conclusions appear in the test results. Summary of the invention

[0004] The present invention provides a liquid crystal screen test industrial control board and a test method thereof, which are used to solve the huge technical defects of the existing test technology. The existing technology can often only test the stability of the voltage, but cannot test the limit voltage, stability and responsiveness of the liquid crystal screen. The test results are all reflected in the form of data. The test can only be based on automatic testing, and the test voltage cannot be adjusted at all times.

[0005] In a first aspect, the present invention provides a liquid crystal screen test industrial control board, characterized in that it includes:

[0006] A main control chip, a driving circuit, a test circuit, a test response circuit and a test adjustment circuit; wherein the main control chip is electrically connected to the driving circuit, the test circuit, the test response circuit and the adjustment circuit respectively, the main control chip is connected to a test button, and the test button is connected to the driving circuit;

[0007] The input end of the driving circuit is used to connect the driving power supply;

[0008] The test circuit includes a first LCD adapter interface and a host interface, wherein the first LCD adapter interface is used to connect to the LCD to be tested, and the host interface is used to connect to the computer device;

[0009] The regulating circuit includes a regulator, the regulator is connected to a first transistor and a second transistor respectively, the first transistor is connected to a third row of resistors, the second transistor is connected to a fourth row of resistors, the first transistor and the second transistor are connected to a main control chip, the first row of resistors is used to adjust the cooling parameters of the liquid crystal display screen, and the fourth row of resistors is used to adjust the TEC parameters of the liquid crystal display screen;

[0010] The test response circuit includes LED lights and indicator lights.

[0011] In combination with the first aspect, the driving circuit includes a first resistor array, a first signal amplifier, a variable resistor, and a voltage regulator; wherein the output end of the first resistor array is electrically connected to the input end of the first signal amplifier, the output end of the first signal amplifier is electrically connected to the variable resistor and the voltage regulator respectively, and the variable resistor and the voltage regulator are respectively connected to the main control chip.

[0012] In combination with the first aspect, the first resistor array is further connected to the variable resistor via a first diode, and the output end of the first signal amplifier is connected to the variable resistor via a second diode.

[0013] In combination with the first aspect, the first LCD screen adapter interface is connected to the crystal oscillator through the fifth signal amplifier, and is connected to the main control chip through the crystal oscillator; the host interface is connected to the main control chip through the sixth signal amplifier and the fourth signal amplifier through the potentiometer.

[0014] In combination with the first aspect, a third switch tube is further arranged between the third resistor and the fourth resistor, and the third switch tube controls the on-off between the third resistor and the first transistor and between the fourth resistor and the second transistor respectively.

[0015] In combination with the first aspect, the indicator lights include a breakdown indicator light, a stability indicator light, a response indicator light and a direction indicator light.

[0016] In a second aspect, the present invention provides a liquid crystal screen testing method, which is applicable to the above-mentioned liquid crystal screen testing industrial control board, and the method comprises:

[0017] When the main control chip and the drive circuit receive the test signal from the test button, the test industrial control board is powered on;

[0018] The voltage data and voltage direction data output in real time by the cooling terminal and TEC terminal of the test LCD are obtained through the first LCD adapter interface, and the test mode is adjusted through the regulator to output the test result; wherein the test result is a test deviation displayed by multiple indicator lights, and the test deviation data is output to a computer device through a host interface for real-time display; wherein the test mode includes a breakdown test mode, a stability test mode and a response test mode.

[0019] In combination with the second aspect, the following steps are included:

[0020] Set the breakdown test time, and adjust the real-time voltage of the LCD cooling terminal and TEC terminal through the regulator, and receive the real-time return voltage;

[0021] When the real-time return voltage is 0 or infinite within the breakdown test time, the real-time test voltage adjusted by the regulator is determined, and the real-time test voltage is used as the breakdown voltage, and the breakdown indicator light is on.

[0022] In combination with the second aspect, the following steps are included:

[0023] Preset the test time, configure the regulator to the default state, and use the real-time voltage of the LCD cooling terminal and the TEC terminal in the default state as the initial voltage;

[0024] Take the initial voltage as the reference voltage, determine whether there is a voltage change during the test time, and record the time point of the voltage change;

[0025] Calculate the voltage mean at different voltage change time points, and determine the deviation between the voltage mean and the initial voltage. When the deviation exceeds the preset threshold, the stability indicator light turns on.

[0026] In combination with the second aspect, the response test mode includes the following steps:

[0027] Pre-set the initial test time point and adjust the test voltage at the initial test time point;

[0028] Get the feedback voltage of the cooling terminal and TEC terminal of the LCD display, and when the feedback voltage is consistent with the adjustment test voltage, determine the test time, and use the test time as the response time. When the response time exceeds the preset response threshold, the response indicator light is on.

[0029] The beneficial effects of the present invention are:

[0030] The present invention is an industrial control board for testing a liquid crystal screen, which is used for testing the circuit function of the liquid crystal screen. The industrial control board of the present invention can firstly perform remote testing when testing the liquid crystal screen. The industrial control board of the present invention can be connected to a computer device, and the remote testing is realized through a test system built into the computer device. The test industrial control board of the present invention is installed with a regulator, and the temperature control related parameters of the liquid crystal screen under different circuit control parameters are adjusted during the test process by the regulator. Through the temperature control related parameters, the optimal parameters of the liquid crystal screen during operation are determined, and it is judged whether the liquid crystal screen has a fault.

[0031] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0032] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 This is a PCB structure diagram of a liquid crystal screen test industrial control board in an embodiment of the present invention;

[0035] Figure 2 This is a practical schematic diagram of a PCB of a liquid crystal screen test industrial control board in an embodiment of the present invention;

[0036] Figure 3 The present invention is a flow chart of a method for testing a liquid crystal screen according to an embodiment of the present invention.

[0037] Figure 4 It is the setting interface of the control panel when the test method of the present invention is implemented;

[0038] Figure 5 It is a viewing interface for power supply waveform when the test method of the present invention is implemented;

[0039] Figure 6 It is a definition interface of different control quantities when implementing the test method of the present invention;

[0040] Figure 7 It is a selection interface of PDU power supply parameters when implementing the test method of the present invention;

[0041] Figure 8 It is the execution substation control interface of the PDU power supply when the test method of the present invention is implemented;

[0042] Fig. 9 It is the real-time charging and discharging interface of the PDU power supply when the test method of the present invention is implemented;

[0043] Fig.10 It is a setting interface for basic test power supply properties when implementing the test method of the present invention;

[0044] Fig.11 It is a circuit breaker setting interface when the test method of the present invention is implemented;

[0045] Fig.12 It is a power supply parameter setting interface when implementing the test method of the present invention;

[0046] Fig.13 It is a power supply wiring setting interface when implementing the test method of the present invention;

[0047] Fig.14 It is a switch control interface when the test method of the present invention is implemented;

[0048] Fig.15 It is the PUD power supply monitoring interface when the test method of the present invention is implemented;

[0049] Fig.16 It is a display interface for monitoring data information when the test method of the present invention is implemented;

[0050] Fig.17 It is a display interface for fault information when the test method of the present invention is implemented. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0052] As an embodiment of the present invention, Figure 1 and Figure 2 As shown, the present invention proposes a liquid crystal screen test industrial control board, comprising:

[0053] A main control chip, a driving circuit, a test circuit, a test response circuit and a test adjustment circuit; wherein the main control chip is electrically connected to the driving circuit, the test circuit, the test response circuit and the adjustment circuit respectively, the main control chip is connected to a test button, and the test button is connected to the driving circuit;

[0054] The input end of the driving circuit is used to connect the driving power supply;

[0055] The test circuit includes a first LCD adapter interface and a host interface, wherein the first LCD adapter interface is used to connect to the LCD to be tested, and the host interface is used to connect to the computer device;

[0056] The regulating circuit includes a regulator, the regulator is connected to a first transistor and a second transistor respectively, the first transistor is connected to a third row of resistors, the second transistor is connected to a fourth row of resistors, the first transistor and the second transistor are connected to a main control chip, the first row of resistors is used to adjust the cooling parameters of the liquid crystal display screen, and the fourth row of resistors is used to adjust the TEC parameters of the liquid crystal display screen;

[0057] The test response circuit includes LED lights and indicator lights.

[0058] The principle of the above technical solution is:

[0059] The LCD test industrial control board of the present invention is mainly composed of five parts, namely, a main control chip, a driving circuit, a test circuit, a test response circuit and an adjustment circuit. These five modules cooperate with each other to form a complete LCD test industrial control board.

[0060] The main control chip is the core part of the LCD test industrial control board, which is responsible for controlling the operation of the entire LCD test industrial control board; the main control chip uses chips from the 74 series, CD series, LM series and UA741 combinational logic chip series. For example: the STC90C516RD chip + single-chip microcomputer is used as the core of the entire LCD test industrial control board.

[0061] The driving circuit is responsible for supplying power to the LCD screen; the driving power used by the driving circuit is a DC point after the external power supply is converted and stepped down.

[0062] The test circuit is responsible for connecting the LCD screen to be tested with the computer equipment (after the LCD screen test industrial control board is connected to the computer equipment, the LCD screen test system will be loaded in the computer equipment), transmitting the test data to the computer equipment, so as to display the specific test results;

[0063] The test response circuit is responsible for displaying the feedback information of the LCD screen during the test in real time;

[0064] The regulating circuit is responsible for adjusting various test parameters of the LCD screen, thereby obtaining multiple groups of different test results and realizing the comparison of the test results.

[0065] In the design of the main control chip, a test button is specially set up on the main control chip, which is convenient for operators to start and stop the test by directly controlling the main control chip. The test button is connected to the drive circuit, and the drive circuit can select different drive voltages to test the LCD screen as needed, to test the LCD screen's sensitivity to the drive voltage and the voltage range of the drive voltage, to prevent the LCD screen from being started by a drive voltage that does not meet the preset voltage range, causing other components to be damaged due to voltage abnormalities.

[0066] In the design of the driving circuit, its input end is mainly used to connect the driving power supply to provide test voltage for the entire LCD test industrial control board. At the same time, it can provide driving voltage for the LCD screen to drive the LCD screen to start.

[0067] The design of the test circuit mainly includes two interfaces, namely the first LCD adapter interface and the host interface. The first LCD adapter interface is responsible for connecting the LCD screen to be tested, while the host interface is responsible for connecting the computer device. Through the first LCD adapter interface, the test process can be directly connected to the existing LCD screen; through the host interface, the computer is connected to perform remote testing, which increases the spatial distance of the test.

[0068] In the design of the regulation circuit, a special regulator is set up to accurately adjust parameters for different LCD screens. For example, the regulator can be connected to the first transistor and the second transistor respectively, the first transistor is connected to the third resistor, and the second transistor is connected to the fourth resistor. The main control chip U2 realizes signal regulation and level conversion through the third resistor and the fourth resistor under the regulation of the transistor.

[0069] The design of the test response circuit also includes LED lights and indicator lights. When the test data of the LCD screen changes, these indicators will immediately respond and show the corresponding changes, such as when there are risk conditions such as overvoltage and overflow.

[0070] In the actual test process, after the LCD screen test industrial control board of the present invention is connected to the computer equipment, the specific control process is as follows:

[0071] In specific operations, you can log in by opening the login interface, set the operator, password, serial number, etc., click to set the login form, click to dial, log in, log out and select the login form. The above login interface is mainly the function of the test system supporting the LCD screen test industrial control board.

[0072] It can be controlled through the control panel. In the interface shown below, you can view the corresponding time base and corresponding voltage information. Click to move it vertically and set the trigger level. Click to set it with one key (such as Figure 4 As shown), on the function selection page, you can select the corresponding information. Figure 4 The one-key setting is mainly used to set the basic setting function of the LCD screen test industrial control board when setting the LCD screen test.

[0073] When conducting actual tests, you can view the test waveform to determine the power supply waveform information of the LCD screen. Figure 5 As shown in the figure, when displaying waveforms, you can set different ports, analog quantities and substations on the LCD screen and set their definitions, such as Figure 6 As shown. Substation definition: Click to perform the corresponding substation definition operation, set its type, and position. Port definition: On the port page, you can select the corresponding port information, and you can open and close it. Analog quantity definition: You can perform the corresponding analog quantity setting operation, and perform the upper and lower display setting operation of the corresponding power-off value. And select the power supply for the test. The test power supply is the PDU power supply. There are multiple power supply test options, such as Figure 7 In actual operation, you can click on the corresponding substation to view the manual execution status. The information to be viewed includes PDU power information and PDU power status, such as Figure 8 Shown and Fig. 9 As shown in the figure, the PDU power information is mainly used to control the voltage distribution of the LCD test industrial control board.

[0074] like Fig.11 As shown, the circuit breaker of the present invention is set up (the circuit breaker is set between the test button of the present invention and the drive circuit), and the corresponding tripping and closing operations are performed on it. Click to set the action time, the tripping position, etc., and click to save. You can also set the basic properties of the test. The page can set its name, PDU power name, power information, output conditions, and corresponding impedance value parameters. You can also set node properties and select the corresponding node type information. Click to set it and the information balance node, the corresponding PQ node, and the PV node. View the corresponding bus voltage information, line flow, transformer flow, and the corresponding PDU power flow, load flow, etc. Click to select to view its name, PDU power, and over-limit high value.

[0075] like Fig.12 As shown, for the power supply parameters during the LCD screen test, the system parameter setting interface can also be used to set the corresponding power supply parameters, including the corresponding usage information and the corresponding power supply information. The page can be used to set the corresponding discharge capacity, current, and voltage protection value. The PDU power supply of the tested LCD screen can be charged, including the corresponding switch PDU power supply wiring setting operation, and the corresponding wiring method information can be viewed, such as Fig.13 shown.

[0076] You can view the corresponding information on the page, including the control operation of the switches of the corresponding lines. Click to select the corresponding function operation, click to select the corresponding, click the page function button to return to the previous level, and you can turn the power on and off to realize the switch control function, such as Fig.14 shown.

[0077] On the test display, you can perform PDU power monitoring to see the corresponding PDU power monitoring operations, including the corresponding voltage, current, and corresponding safety information, including the corresponding monitoring curve information, such as Fig.15 shown.

[0078] Specific monitoring information, such as Fig.16 As shown, corresponding information can be viewed, including corresponding information of various power supply lines, including corresponding battery information, so as to realize power supply protection. Corresponding information can be viewed on the page, including battery protection information. Click to conduct corresponding inspection, as well as corresponding confirmation to terminate discharge, and corresponding continue discharge information can be viewed.

[0079] During the fault inspection, the adjustment circuit is realized. When operating the fault information page on the computer equipment, the regulator of the LCD screen test industrial control board automatically adjusts the specific control parameters. During the operation, the corresponding fault information can be operated by opening the fault information page, and the fault recording can be tested. Check the corresponding fault information, such as Fig.17 As shown. The information displayed includes opening the fault information page to operate the corresponding fault information and testing the fault recording. The corresponding fault information can be viewed. Abnormal information display: Click and select the corresponding abnormal information on the page to display the abnormal information.

[0080] The beneficial effects of the above technical solution are:

[0081] The present invention is an industrial control board for testing a liquid crystal screen, which is used for testing the circuit function of the liquid crystal screen. The industrial control board of the present invention can firstly perform remote testing when testing the liquid crystal screen. The industrial control board of the present invention can be connected to a computer device, and the remote testing is realized through a test system built into the computer device. The test industrial control board of the present invention is installed with a regulator, and the temperature control related parameters of the liquid crystal screen under different circuit control parameters are adjusted during the test process by the regulator. Through the temperature control related parameters, the optimal parameters of the liquid crystal screen during operation are determined, and it is judged whether the liquid crystal screen has a fault.

[0082] As an embodiment of the present invention, the driving circuit includes a first resistor P1, a first signal amplifier U1, a variable resistor L2, and a voltage regulator U3; wherein the output end of the first resistor P1 is electrically connected to the input end of the first signal amplifier U1, the output end of the first signal amplifier U1 is electrically connected to the variable resistor L2 and the voltage regulator U3, respectively, and the variable resistor L2 and the voltage regulator U3 are respectively connected to the main control chip.

[0083] The drive circuit of the present invention has components such as a first resistor array P1, a first signal amplifier U1, a variable resistor L2 and a voltage regulator U3 in terms of structure. The function of the first resistor array P1 is to adjust the drive current and improve the size and stability of the drive circuit. Furthermore, by adjusting the size of the first resistor array, the size of the drive current is effectively controlled to ensure the control accuracy and stability of the drive voltage. The first signal amplifier U1 converts the slight changes of the liquid crystal screen to be tested into obvious electrical signals. The first signal amplifier U1 automatically adjusts the size of the output signal according to the different characteristics of the liquid crystal screen to be tested (the interference intensity of the signal and the size of the signal), so that the test results are more accurate. The function of the variable resistor L2 and the voltage regulator U3 is to stabilize the output voltage and prevent the output voltage from fluctuating due to changes in the drive current. When the drive current changes, the variable resistor L2 and the voltage regulator U3 will automatically adjust their own resistance value or voltage to keep the output voltage stable. The first resistor array P1, the first signal amplifier U1, the variable resistor L2 and the voltage regulator U3 are connected to the main control chip. In the driving circuit of the present invention, the driving voltage can be kept stable through the control of the variable resistor L2 and the first resistor array P1, which is more conducive to testing and has more precise control accuracy.

[0084] As an embodiment of the present invention, the first resistor array P1 is further connected to the variable resistor L2 via the first diode TS1, and the output end of the first signal amplifier U1 is connected to the variable resistor via the second diode TS2.

[0085] The present invention provides a first diode TS1 between the first resistor P1 and the variable resistor L2 to prevent the reverse voltage from occurring when the driving voltage is adjusted. Because the first resistor P1 of the present invention is connected to the variable resistor, there may be a reverse voltage. The first diode TS1 can prevent the reverse voltage and, at the same time, enhance the voltage stabilization capability of the driving voltage. The second diode TS2 can ensure that there is no interference in the output signal after amplification, and the unidirectional conductivity of the diode is used to realize the detection function.

[0086] As an embodiment of the present invention, the first LCD screen adapter interface P5 is connected to the crystal oscillator CPY1 through the fifth signal amplifier U5, and is connected to the main control chip U2 through the crystal oscillator CPY1; the host interface P6 is connected to the main control chip U2 through the sixth signal amplifier and the fourth signal amplifier through the potentiometer PRP1.

[0087] The present invention can make the frequency more accurate by generating piezoelectric effect through the LCD screen transfer interface P5 and the main control chip U2 of the crystal oscillator CPY1. At the same time, the test data of the LCD screen can be transmitted in real time through different circuit channels and uploaded to the computer device. The sixth signal amplifier and the fourth signal amplifier are connected to the potentiometer PRP1 to adjust the amplitude and waveform of the signal.

[0088] As an embodiment of the present invention, a third switch tube TS4 is further provided between the third resistor array P3 and the fourth resistor array P4, and the third switch tube TS4 controls the on-off between the third resistor array P3 and the first transistor Q1 and the fourth resistor array P4 and the second transistor P2.

[0089] The third switch tube TS4 of the present invention can control the third resistor P3 or the fourth resistor P4 to adjust the test voltage, and adjust the voltage parameters and voltage direction of the cooling terminal and the TEC terminal. The liquid crystal display screen tested by the present invention is a liquid crystal display screen with a heat dissipation function, so the voltage parameters and voltage direction of the cooling segment and the TEC segment of the liquid crystal display screen can be directly adjusted.

[0090] As an embodiment of the present invention, the indicator lights include a breakdown indicator light, a stability indicator light, a response indicator light and a direction indicator light.

[0091] The present invention is provided with a plurality of different indicator lights. Through the plurality of different indicator lights, during the test process, if the computer interface is other interfaces or the computer is stuck, it can be directly judged by the color of the indicator light whether there is a risk in the LCD screen tested during the real-time test process.

[0092] As an embodiment of the present invention, Figure 3 As shown, the present invention proposes a liquid crystal screen testing method, which is applicable to the above-mentioned liquid crystal screen testing industrial control board, and the method includes:

[0093] When the main control chip and the drive circuit receive the test signal from the test button, the test industrial control board is powered on;

[0094] The voltage data and voltage direction data output in real time by the cooling terminal and TEC terminal of the test LCD are obtained through the first LCD adapter interface, and the test mode is adjusted through the regulator to output the test result; wherein the test result is a test deviation displayed by multiple indicator lights, and the test deviation data is output to a computer device through a host interface for real-time display; wherein the test mode includes a breakdown test mode, a stability test mode and a response test mode.

[0095] When the main control chip and the drive circuit receive the test signal of the test button, the test industrial control board starts to power on. At this time, all modules will enter the working state and are ready to receive the test instructions from the user. The user can send a test signal through the test button to trigger the main control chip and the drive circuit to start executing the test task. This test signal can be manually input or automatically triggered. After receiving the test signal, the main control chip starts to control the work of the drive circuit. The drive circuit is responsible for converting the test signal into the corresponding drive current and voltage so as to drive the liquid crystal screen for testing. In the drive circuit, components such as the first row of resistors, the first signal amplifier, the variable resistor and the voltage regulator are used, and each of them has different functions. The first row of resistors is used to adjust the current size, the first signal amplifier converts the change of the liquid crystal screen to be tested into an electrical signal, and the variable resistor and the voltage regulator are responsible for stabilizing the output voltage. The precise regulation of these components ensures the accuracy and stability of the test. Under the control of the main control chip, the liquid crystal screen starts to execute the actual test task. The test mode includes a breakdown test mode, a stability test mode and a response test mode. These test modes cover the main usage scenarios of the liquid crystal screen and can comprehensively evaluate the performance of the liquid crystal screen. Each test mode will generate corresponding test results, which will be directly displayed through multiple indicator lights. Test deviation data will also be output to the computer device through the host interface for users to view and analyze. After the test is completed, the LCD screen will automatically exit the working state and wait for the next use. The entire test process is precisely controlled by the main control chip and drive circuit to ensure safety and stability.

[0096] As an embodiment of the present invention, the following steps are included:

[0097] Set the breakdown test time, and adjust the real-time voltage of the LCD cooling terminal and the TEC terminal through the regulator, and receive the real-time return voltage; when the real-time return voltage is 0 or infinite within the breakdown test time, determine the real-time test voltage adjusted by the regulator, and use the real-time test voltage as the breakdown voltage, and the breakdown indicator light is on.

[0098] When the present invention is actually implemented, the breakdown test time is set as:

[0099] According to the specific test requirements, a suitable breakdown test time will be set, such as 1 second or 2 seconds. Adjust the real-time voltage of the LCD cooling terminal and TEC terminal through the regulator: Before the breakdown test time arrives, use the regulator to accurately adjust the real-time voltage of the LCD cooling terminal and TEC terminal to reach the preset value. This is to ensure that the possible fault conditions can be accurately simulated during the actual breakdown process. Receive real-time return voltage: After the set breakdown test time is over, the return voltage of the LCD cooling terminal and TEC terminal is monitored in real time and used as the real-time return voltage. This is to record the voltage changes during the actual breakdown process, which is convenient for subsequent data analysis and troubleshooting. When the real-time return voltage is 0 or infinite during the breakdown test time, determine the real-time test voltage adjusted by the regulator, and use the real-time test voltage as the breakdown voltage: When the real-time return voltage is abnormal, that is, it becomes 0 or infinite, it is immediately judged as a sign of breakdown. At the same time, record the real-time test voltage at this time as an important basis for subsequent analysis and troubleshooting. The breakdown indicator light is on: Once the breakdown is confirmed, the breakdown indicator light is immediately lit as a warning. This is to allow the operator to understand the status of the LCD screen in a timely manner and avoid potential dangers caused by not being able to find problems for a long time.

[0100] As an embodiment of the present invention, the following steps are included:

[0101] Preset the test time, configure the regulator to the default state, and use the real-time voltage of the LCD cooling terminal and the TEC terminal in the default state as the initial voltage;

[0102] Take the initial voltage as the reference voltage, determine whether there is a voltage change during the test time, and record the time point of the voltage change;

[0103] Calculate the voltage mean at different voltage change time points, and determine the deviation between the voltage mean and the initial voltage. When the deviation exceeds the preset threshold, the stability indicator light turns on.

[0104] In actual implementation, pre-set the test time: Before conducting the stability test, we need to pre-set the test time so that the voltage changes can be monitored during the test. Set a suitable test time, such as 1 second or 2 seconds. Configure the regulator to the default state: Before the preset test time arrives, configure the regulator to the default state and connect it to the cooling terminal and TEC terminal of the LCD screen. The purpose of this is to ensure that the voltage value at the beginning of the test is the default state. Use the real-time voltage of the LCD screen cooling terminal and TEC terminal in the default state as the initial voltage: After the test time arrives, obtain and record the real-time voltage of the LCD screen cooling terminal and TEC terminal in real time as the initial voltage value of the entire test process. Use the initial voltage as the reference voltage and determine whether there is a voltage change during the test time: During the set test time, monitor the voltage change of the LCD screen cooling terminal and TEC terminal in real time. If there is a voltage change, record it. At the same time, record the time point of the voltage change with the initial voltage as the reference. Calculate the voltage mean at different voltage change time points and determine the deviation between the voltage mean and the initial voltage: Sum the voltage change at each time point and divide it by the number of time points to obtain the voltage mean. Next, the voltage mean is compared with the initial voltage. If the deviation exceeds the preset threshold, it means that the LCD screen has voltage fluctuations. When the deviation exceeds the preset threshold, the stability indicator lights up: When the deviation between the voltage mean and the initial voltage exceeds the preset threshold, the stability indicator lights up immediately to alert the user. This step is to allow the operator to promptly discover the voltage stability problem of the LCD screen and prevent a larger range of voltage fluctuations.

[0105] As an embodiment of the present invention, the response test mode includes the following steps:

[0106] Pre-set the initial test time point and adjust the test voltage at the initial test time point;

[0107] Get the feedback voltage of the cooling terminal and TEC terminal of the LCD display, and when the feedback voltage is consistent with the adjustment test voltage, determine the test time, and use the test time as the response time. When the response time exceeds the preset response threshold, the response indicator light is on.

[0108] Preset the initial test time point and adjust the test voltage at the initial test time point: Preset an initial test time point, which is usually the start time of a fast response. Then at this time point, the test voltage will be adjusted to make the voltage reach a specific set value. This set value is the best value obtained based on experience, or it can be the optimal solution obtained by analyzing historical data. Get the feedback voltage of the cooling terminal and TEC terminal of the LCD screen, and when the feedback voltage is consistent with the adjusted test voltage, determine the test time, and use the test time as the response time. When the response time exceeds the preset response threshold, the response indicator light is on: The feedback voltage of the cooling terminal and TEC terminal of the LCD screen will be continuously monitored to see if they can quickly follow our adjustment voltage to make corresponding adjustments. If their feedback voltage can completely match the set adjustment voltage, it means that the response speed of the LCD screen is very fast. At this time, the test time can be confirmed and this time can be used as the response time. If the feedback voltage of the LCD screen fails to keep up with the adjustment voltage in time for a period of time, it means that the response speed of the LCD screen is very slow. At this time, a response indicator light needs to be displayed on the screen to warn.

[0109] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A liquid crystal screen test industrial control board, characterized in that: include: A main control chip (U2), a driving circuit, a test circuit, a test response circuit and a test adjustment circuit; wherein the main control chip (U2) is electrically connected to the driving circuit, the test circuit, the test response circuit and the adjustment circuit respectively, the main control chip (U2) is connected to a test button (KEY1), and the test button (KEY1) is connected to the driving circuit; The input end of the driving circuit is used to connect the driving power supply; The test circuit comprises a first LCD adapter interface (P5) and a host interface (P6), wherein the first LCD adapter interface (P5) is used to connect to the LCD to be tested, and the host interface (P6) is used to connect to the computer device; The regulating circuit comprises a regulator (L3), the regulator (L3) is respectively connected to a first transistor (Q1) and a second transistor (Q2), the first transistor (Q1) is connected to a third resistor (P3), the second transistor (Q2) is connected to a fourth resistor (P4), the first transistor (Q1) and the second transistor (Q2) are connected to a main control chip (U2), the third resistor (P3) is used to regulate the cooling parameters of the liquid crystal display screen, and the fourth resistor (P4) is used to regulate the TEC parameters of the liquid crystal display screen; The test response circuit includes LED lights and indicator lights.

2. The LCD screen test industrial control board according to claim 1, characterized in that: The driving circuit comprises a first resistor row (P1), a first signal amplifier (U1), a variable resistor (L2), and a voltage regulator (U3); wherein the output end of the first resistor row (P1) is electrically connected to the input end of the first signal amplifier (U1), the output end of the first signal amplifier (U1) is electrically connected to the variable resistor (L2) and the voltage regulator (U3), respectively, and the variable resistor (L2) and the voltage regulator (U3) are respectively connected to a main control chip.

3. The LCD screen test industrial control board as claimed in claim 2, characterized in that: The first resistor array (P1) is also connected to the variable resistor (L2) via a first diode (TS1), and the output end of the first signal amplifier (U1) is connected to the variable resistor (L2) via a second diode (TS2).

4. The LCD screen test industrial control board according to claim 1, characterized in that: The first LCD screen adapter interface (P5) is connected to the crystal oscillator (CPY1) through the fifth signal amplifier (U5), and is connected to the main control chip (U2) through the crystal oscillator (CPY1); the host interface (P6) is connected to the main control chip through the sixth signal amplifier and the fourth signal amplifier through the potentiometer (PRP1).

5. The LCD screen test industrial control board according to claim 1, characterized in that: A third switch tube (TS4) is also provided between the third resistor (P3) and the fourth resistor (P4), and the third switch tube (TS4) controls the on-off between the third resistor (P3) and the first transistor (Q1) and between the fourth resistor (P4) and the second transistor (P2).

6. The LCD screen test industrial control board according to claim 1, characterized in that: The indicator lights include a breakdown indicator light, a stability indicator light, a response indicator light and a direction indicator light.

7. A liquid crystal screen testing method, applicable to a liquid crystal screen testing industrial control board according to any one of claims 1 to 6, the method comprising: When the main control chip (U2) and the drive circuit receive the test signal from the test button, the test industrial control board is powered on; The voltage data and voltage direction data outputted in real time by the cooling terminal and the TEC terminal of the test LCD are obtained through the first LCD adapter interface (P5), and the test mode is adjusted through the regulator (L3) to output the test result; wherein the test result is a test deviation displayed by a plurality of indicator lights, and the test deviation data is output to a computer device through a host interface for real-time display; wherein the test mode includes a breakdown test mode, a stability test mode and a response test mode.

8. A liquid crystal screen testing method as claimed in claim 7, characterized in that: In the breakdown test mode, the following steps are included: Set the breakdown test time, and adjust the real-time voltage of the LCD cooling terminal and the TEC terminal through the regulator (L3), and receive the real-time return voltage; When the real-time return voltage is 0 or infinite within the breakdown test time, the real-time test voltage adjusted by the regulator (L3) is determined, and the real-time test voltage is used as the breakdown voltage, and the breakdown indicator light is on.

9. A liquid crystal screen testing method as claimed in claim 7, characterized in that: The stability test mode includes the following steps: Preset the test time, configure the regulator (L3) to the default state, and use the real-time voltage of the LCD cooling terminal and the TEC terminal in the default state as the initial voltage; Take the initial voltage as the reference voltage, determine whether there is a voltage change during the test time, and record the time point of the voltage change; Calculate the voltage mean at different voltage change time points, and determine the deviation between the voltage mean and the initial voltage. When the deviation exceeds the preset threshold, the stability indicator light turns on.

10. A liquid crystal screen testing method as claimed in claim 7, characterized in that: The response test mode includes the following steps: Pre-set the initial test time point, and adjust the test voltage at the initial test time point; obtain the feedback voltage of the cooling terminal and the TEC terminal of the LCD screen, and when the feedback voltage and the adjusted test voltage are consistent, determine the test time, and use the test time as the response time. When the response time exceeds the preset response threshold, the response indicator light is on.

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